Baen just published a new book by Frank Chadwick (who wrote the Space 1889 rules): "The Forever Engine." Takes place in an alternate universe 1888 where (to quote the review) "His Majesty’s airships troll the sky powered by antigrav liftwood as a cabal of Iron Lords tightens its hold on a Britain choked by the fumes of industry. Mars has been colonized, and clockwork assassins stalk the European corridors of power. And somewhere far to the east, the Old Man of the Mountains plots the end of the world with his Forever Engine."